Spiral saw



FIG. 1 is a left side perspective view of a spiral saw.

FIG. 2 is a rear view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines are for illustrative purposes only and form no part ofthe claimed design.

The ornamental design for a spiral saw, as shown and described.